EP1508638A1 - Verfahren zur Behandlung von störende Gefässzellen enthaltendem Zellstoff - Google Patents
Verfahren zur Behandlung von störende Gefässzellen enthaltendem Zellstoff Download PDFInfo
- Publication number
- EP1508638A1 EP1508638A1 EP04015698A EP04015698A EP1508638A1 EP 1508638 A1 EP1508638 A1 EP 1508638A1 EP 04015698 A EP04015698 A EP 04015698A EP 04015698 A EP04015698 A EP 04015698A EP 1508638 A1 EP1508638 A1 EP 1508638A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- consistency
- vascular cells
- pulp
- less
- dispersion
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
- 238000000034 method Methods 0.000 title claims abstract description 24
- 239000000203 mixture Substances 0.000 claims abstract 4
- 210000005167 vascular cell Anatomy 0.000 claims description 26
- 239000000835 fiber Substances 0.000 claims description 10
- 239000006185 dispersion Substances 0.000 claims description 9
- 239000000725 suspension Substances 0.000 claims description 4
- 239000011121 hardwood Substances 0.000 claims description 3
- 230000001413 cellular effect Effects 0.000 abstract 4
- 239000002023 wood Substances 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 5
- 239000002245 particle Substances 0.000 description 3
- 238000010790 dilution Methods 0.000 description 2
- 239000012895 dilution Substances 0.000 description 2
- 238000009826 distribution Methods 0.000 description 2
- 239000010893 paper waste Substances 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 230000001133 acceleration Effects 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000029087 digestion Effects 0.000 description 1
- 238000004090 dissolution Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 230000002209 hydrophobic effect Effects 0.000 description 1
- 230000001771 impaired effect Effects 0.000 description 1
- 230000002452 interceptive effect Effects 0.000 description 1
- 238000004898 kneading Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 239000002562 thickening agent Substances 0.000 description 1
- 238000009966 trimming Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Images
Classifications
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21D—TREATMENT OF THE MATERIALS BEFORE PASSING TO THE PAPER-MAKING MACHINE
- D21D5/00—Purification of the pulp suspension by mechanical means; Apparatus therefor
- D21D5/18—Purification of the pulp suspension by mechanical means; Apparatus therefor with the aid of centrifugal force
- D21D5/24—Purification of the pulp suspension by mechanical means; Apparatus therefor with the aid of centrifugal force in cyclones
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21B—FIBROUS RAW MATERIALS OR THEIR MECHANICAL TREATMENT
- D21B1/00—Fibrous raw materials or their mechanical treatment
- D21B1/04—Fibrous raw materials or their mechanical treatment by dividing raw materials into small particles, e.g. fibres
- D21B1/12—Fibrous raw materials or their mechanical treatment by dividing raw materials into small particles, e.g. fibres by wet methods, by the use of steam
- D21B1/30—Defibrating by other means
- D21B1/34—Kneading or mixing; Pulpers
Definitions
- the invention relates to a method according to the preamble of claim 1.
- vascular cells As is well known, fresh pulps containing rapidly growing hardwoods, especially tropical hardwoods are used, so-called vascular cells (English: vessels), which have relatively large dimensions due to the climatic conditions. you Amount of pulp is usually at 3 to 5%. These vascular cells are used in the Pulp production are not removed and are in the paper made from such a pulp disturbing, because they are responsible for certain disadvantages. So it can be e.g. that happen Vascular cells break out of the paper structure, whereby the surface deteriorates and the Paper properties are impaired. Unlike the pulp fibers, they are hydrophobic Character.
- the invention is therefore based on the object to provide a method with which it is possible to reduce the disadvantages that result from the content of vascular cells, or completely eliminate and at the same time the desired properties, such as specific volume, if possible to obtain.
- vascular cells threatening loss of quality for the pulp produced later paper no longer occur.
- the vast majority of vascular cells can be removed, and they may not removed vascular cells are anchored (fused) in the fiber composite so that they remain in it, even if the paper is claimed.
- the process is usually used in stock preparation at a paper mill. It can but also already be carried out in the pulp mill after digestion.
- Fig. 1 shows an important example for carrying out the method. That is how it works Pulp 1 in suspended form or after - not shown - dissolution in water and possibly Pre-cleaning in a thickener 2 brought to a consistency between 15 and 35%.
- the Subsequent dispersion takes place here in a known per se from the waste paper preparation Disk disperger 3. In other cases a kneading disperger can be used.
- the trimmings of disk dispersers have a very large number of slots and become relatively fast moving past each other.
- An example is shown in DE 30 47 013 A1. Knetdisperger contrast (see, e.g. DE 42 37 433 A1) have a coarser structure and work with less Relative speeds.
- the latter usually consists of a large number of highly efficient hydrocyclones, so-called cleaners, working with centrifugal fields that reach at least 200 times the gravitational acceleration.
- cleaners working with centrifugal fields that reach at least 200 times the gravitational acceleration.
- These are also known from waste paper processing.
- With the reject 7 of these cleaners will be Vascular cells deposited while accepting 8 a raw material for flawless paper quality represents. Besides the benefit of Accept 8, there are no harmful vascular cells to contain the fibers in good condition, especially what drainage properties on the Paper machine and specific volume of the paper produced.
- the in the reject 7 contained fibers may by other - not shown - Cleanerpawn possibly in combination be recovered with mechanical processing.
- the particle size 9 of the vascular cells in the range of 0.1 to 1 mm below applied, increasing to the right.
- the ordinate shows the area-related frequency 10 of the vascular cells found in the sample sheet, for example measured in 1 / mm 2 .
- the diagram has four curves that represent the relationship, depending on the treatment experienced by the pulp used. The uppermost of these curves, the curve 11, represents the frequency distribution of the vascular cells in the pulp 1, ie before it has been subjected to the process according to the invention. It turns out that in the initial state, the area-related frequency 10 is relatively high for a small particle size 9 and decreases to larger particle sizes. The merely dispersed substance 4 already has a significantly better quality, which is shown schematically in the curve 13.
- the acceptance 8 of the hydrocyclones has the distribution registered in curve 14, ie there are hardly any vascular cells present.
- the curve 12 has been determined, which lies between the curves 11 and 13 and describes the state after hydrocyclone, bypassing the disk disperger 3. It can therefore be stated that the dispersion already achieves the stated object and that in particular an excellent pulp can be produced by the combination of both process steps, which is practically free of disturbing vascular cells.
- the diagram according to FIG. 2 is intended to show the relationships only qualitatively. It is depending on Pulp species and choice of parameters deviations from this course possible, with the However, fundamental improvement by the inventive method clearly confirmed.
- the accept 8 of the hydrocyclone unit 6 After dispersion and any dilution of the pulp the accept 8 of the hydrocyclone unit 6 again be added, so that a suspension 15 is formed, which is free of interfering vascular cells.
- the in the accept 8 'of the hydrocyclone unit 6 remaining vascular cells are so small that they little disturbing even without dispersion of this partial stream.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- Wood Science & Technology (AREA)
- Paper (AREA)
- Medicines Containing Plant Substances (AREA)
Abstract
Description
- Fig. 1
- ein vereinfacht dargestelltes Verfahrensbeispiel;
- Fig. 2
- ein Diagramm;
- Fig. 3
- eine vereinfacht dargestellte Verfahrensvariante.
Claims (8)
- Verfahren zur Behandlung einer störende Gefäßzellen enthaltenden, insbesondere aus Laubholz hergestellten Frischzellstoffsuspension, durch das die Schädlichkeit der Gefäßzellen ausreichend beseitigt wird,
dadurch gekennzeichnet, dass das Gemisch aus Zellstofffasern und Gefäßzellen bei einer hohen Konsistenz, vorzugsweise zwischen 15 und 35 % dispergiert wird. - Verfahren nach Anspruch 1,
dadurch gekennzeichnet, dass das Gemisch nach dem Dispergieren bei einer niedrigen Konsistenz, vorzugsweise unter 3 % in Hydrozyklonen fraktioniert wird und dass dabei zumindest der überwiegende Teil der Gefäßzellen bei einer Konsistenz unter 3 % in Hydrozyklonen ausgeschieden wird. - Verfahren nach Anspruch 1,
dadurch gekennzeichnet, dass aus dem Gemisch bei einer Konsistenz unter 3 % der überwiegende Teil der Gefäßzellen als Rejekt (7') von Hydrozyklonen ausgeschieden und dass der Rejekt (7') anschließend bei einer Konsistenz zwischen 15 und 35 % dispergiert wird. - Verfahren nach Anspruch 1, 2 oder 3,
dadurch gekennzeichnet, dass die Dispergierung in einem Scheibendisperger bei einer Konsistenz von 25 bis 35 % durchgeführt wird und dass dabei eine spezifische Arbeit von mehr als 70 kWh/t übertragen wird. - Verfahren nach Anspruch 1, 2 oder 3,
dadurch gekennzeichnet, dass die Dispergierung in einem Knetdisperger bei einer Konsistenz von 25 bis 35 % durchgeführt wird und dass dabei eine spezifische Arbeit von mehr als 90 kWh/t übertragen wird. - Verfahren nach Anspruch 1, 2, 3, 4 oder 5,
dadurch gekennzeichnet, dass die Dispergierung bei einer Temperatur unter 70° C durchgeführt wird. - Verfahren nach einem der voranstehenden Ansprüche,
dadurch gekennzeichnet, dass am Zulauf in die Hydrozyklone eine Konsistenz von weniger als 1,3 %, vorzugsweise unter 0,8 %, eingestellt wird. - Verfahren nach einem der voranstehenden Ansprüche,
dadurch gekennzeichnet, dass am Hydrozyklon ein Rejektstrom kontinuierlich abgezogen wird, dessen Größe 10 - 30 Vol% des Zulaufstromes zum Hydrozyklon entspricht.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE2003137821 DE10337821B3 (de) | 2003-08-18 | 2003-08-18 | Verfahren zur Behandlung von störende Gefäßzellen enthaltendem Zellstoff |
| DE10337821 | 2003-08-18 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| EP1508638A1 true EP1508638A1 (de) | 2005-02-23 |
Family
ID=33521565
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP04015698A Withdrawn EP1508638A1 (de) | 2003-08-18 | 2004-07-03 | Verfahren zur Behandlung von störende Gefässzellen enthaltendem Zellstoff |
Country Status (4)
| Country | Link |
|---|---|
| EP (1) | EP1508638A1 (de) |
| AU (1) | AU2004203404A1 (de) |
| BR (1) | BRPI0403189A (de) |
| DE (1) | DE10337821B3 (de) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1889971A1 (de) * | 2006-08-18 | 2008-02-20 | Voith Patent GmbH | Verfahren zur Behandlung eines Papierfasergemisches |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102006012835B3 (de) * | 2006-03-21 | 2007-11-15 | Voith Patent Gmbh | Verfahren zur Behandlung von störende Gefäßzellen enthaltendem Zellstoff |
| US10385508B2 (en) | 2016-03-24 | 2019-08-20 | The Procter & Gamble Company | Process for producing strong and soft tissue and towel products |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0568404A1 (de) * | 1992-04-17 | 1993-11-03 | Kimberly-Clark Corporation | Verfahren zur Behandlung von Papiermacherfasern zur Herstellung von Tissue-Papier |
| DE19816621A1 (de) * | 1998-04-15 | 1999-11-04 | Voith Sulzer Papiertech Patent | Verfahren zur Mahlung von Laubholz-Zellstoff |
| EP1147804A1 (de) * | 2000-04-11 | 2001-10-24 | Voith Paper Patent GmbH | Vorrichtung zur Dispergierung von hochkonsistentem Papierfaserstoff sowie Garnituren für diese Vorrichtung |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AT375417B (de) * | 1980-11-25 | 1984-08-10 | Escher Wyss Gmbh | Dispergiervorrichtung fuer die aufbereitung von altpapierstoff |
| DE4237433C2 (de) * | 1992-11-06 | 1994-05-11 | Voith Gmbh J M | Stoffknetmaschine |
-
2003
- 2003-08-18 DE DE2003137821 patent/DE10337821B3/de not_active Expired - Fee Related
-
2004
- 2004-07-03 EP EP04015698A patent/EP1508638A1/de not_active Withdrawn
- 2004-07-27 AU AU2004203404A patent/AU2004203404A1/en not_active Abandoned
- 2004-07-30 BR BRPI0403189 patent/BRPI0403189A/pt not_active IP Right Cessation
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0568404A1 (de) * | 1992-04-17 | 1993-11-03 | Kimberly-Clark Corporation | Verfahren zur Behandlung von Papiermacherfasern zur Herstellung von Tissue-Papier |
| DE19816621A1 (de) * | 1998-04-15 | 1999-11-04 | Voith Sulzer Papiertech Patent | Verfahren zur Mahlung von Laubholz-Zellstoff |
| EP1147804A1 (de) * | 2000-04-11 | 2001-10-24 | Voith Paper Patent GmbH | Vorrichtung zur Dispergierung von hochkonsistentem Papierfaserstoff sowie Garnituren für diese Vorrichtung |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1889971A1 (de) * | 2006-08-18 | 2008-02-20 | Voith Patent GmbH | Verfahren zur Behandlung eines Papierfasergemisches |
Also Published As
| Publication number | Publication date |
|---|---|
| DE10337821B3 (de) | 2005-01-13 |
| AU2004203404A1 (en) | 2005-03-10 |
| BRPI0403189A (pt) | 2005-05-24 |
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| 17P | Request for examination filed |
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| RAP1 | Party data changed (applicant data changed or rights of an application transferred) |
Owner name: VOITH PATENT GMBH |
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